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5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate as a new Indicator for anionic surface active agents determination / Elwira Katarzyna Wroblewska in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 47, N° 2/2010 (03-04/2010)
[article]
inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 2/2010 (03-04/2010) . - p. 119-122
Titre : 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate as a new Indicator for anionic surface active agents determination Type de document : texte imprimé Auteurs : Elwira Katarzyna Wroblewska, Auteur ; M. Gasiorowska, Auteur ; J. A. Soroka, Auteur Année de publication : 2010 Article en page(s) : p. 119-122 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bromure de dimidium
Colorants
Détergents
Solvatochromisme
Volumétrie (chimie analytique)Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate (Ia) was used as an indicator for anionic surface active agents determination in the manual direct two-phase titration according to the International Standard [ISO 2271:1989] Surface active agents. The solvatochromic dye (Ia) can successfully replace the recommended mixed indicator consisting of a mixture of Acid Blue I and carcinogenic dimidium bromide. The detection of the titration endpoint with use of this dye turned out much easier than with the use of the mixed indicator. The procedure was also modified replacing carcinogenic and mutagenic chloroform with less toxic dichloromethane. The concentrations of the anionic surface – active substances in few commercially available products were determined using modified two-phase titration method. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8881 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012052 - Périodique Bibliothèque principale Documentaires Disponible 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate as a new indicator for anionic surface active agents determination / Elwira Katarzyna Wroblewska in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 2/2011 (03-04/2011)
[article]
inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 2/2011 (03-04/2011) . - p. 127-129
Titre : 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate as a new indicator for anionic surface active agents determination : Part II. influence of pH on the titration results Type de document : texte imprimé Auteurs : Elwira Katarzyna Wroblewska, Auteur ; M. Gasiorowska, Auteur Année de publication : 2011 Article en page(s) : p. 127-129 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bromure de dimidium
Colorants
Détergents
pH
Solvatochromisme
Volumétrie (chimie analytique)Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The work refers to the already published modification of widely used method for anionic active agents determination which concerns the replacement of the mixed indicator, consisting of Acid Blue 1 and carcinogenic Dimidium Bromide, applied in the International Standard ISO 2271:1989 with solvatochromic dye i.e. 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate (1). The value of pKa for examined dye (1) amounts to 6.59 thus the influence of different pH values of the probes on the analysis results was studied i.e. precision of determination of titration endpoint and the same the result of the quantitative analysis. The change of pH for aqueous and apparent pH for organic phase were determined during the titration process. It was shown that there is no effect of the pH change in its range varying from 3.5 to 5 on the results. The modification of the method for the probes which pH do not fit to the range mentioned above is presented. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11120 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012916 - Périodique Bibliothèque principale Documentaires Disponible